I also have a 4870 1GB just laying around I want to trade it for something NVIDIA for folding without losing a ton (I spent $300 on it), I have a guy offering me a 9800GTX+ but I presume thats not really worth it.

Just curious what options I should try and looking for imput I'm willing to trade, and sell! What should I be looking to get that wont break the bank!

9800GTX+ cards are great folders, just an FYI, but id ask for cash ontop of that deal as the 4870s are worth closer to the price of a non sp 216 GTX 260.

For folding the GTS 250s are great cards, their cheap to, you can sometimes pick them up as low as $130. Gaming wise Im pretty sure a single GTX 260 sp 216 would out perform the dual 8800gt's and 2 of them make for a monster system. EVGA GTX 260s are going for around the $200 mark right now. Really it depends on what resolutions your playing at and what games you play.